It is quite common for FCC structured nickel based super alloys to be manufactured as a large single crystals for turbine applications. I am wondering, whether usual manufacturing techniques of FCC single crystals can be applied to a BCC alloy.
Several metals already crystallize in a (BCC) structure. Many of them are available as single crystals such as Barium (https://www.americanelements.com/barium-single-crystal-7440-39-3), Lithium (https://cen.acs.org/materials/energy-storage/Single-crystal-lithium-ion-battery/98/i48) and some others.
Dear Štěpán Gamanov thanks for posting this interesting technical question on RG. As a synthetic chemist I'm not a specialist in this field, but I just came across the following potentially useful literature reference which might help you in your analysis:
The BCC-FCC Phase Transformation Pathways and Crystal Orientation Relationships in Dual Phase Materials From Al-(Co)-Cr-Fe-Ni Alloys
Article The BCC-FCC Phase Transformation Pathways and Crystal Orient...
Fortunately this article has been posted by the authors as public full text on RG. Thus you can freely download it as pdf file. I hope this helps. Good luck with your work!
Dear Štěpán Gamanov , in addition to the answers of Wagner Da Nova Mussel and Frank T. Edelmann , please have at the following papers for a growth prodecure even applicable to BCC crystals:
Article Controlled-Atmosphere Flame Fusion Single-Crystal Growth of ...
See also for an example of single crystal alloys, as you asked above:
Article 1. Title: A Successful Synthesis of the CoCrFeNiAl0.3 Single...